Ideal Body fat percentages for men and women according to age:

Recommended Body Fat Levels for men and women:

Males Age Range (years)	Too Little	Healthy Range	Overweight	Obese
20-30	Below 8%	8 - 19%	19 - 25%	over 25%
31-40	Below 8%	8 - 19%	19 - 25%	over 25%
41-50	Below 11%	11 - 22%	22 - 27%	over 27%
51-60	Below 11%	11 - 22%	22 - 27%	over 27%
61-70	Below 13%	13 - 25%	25 - 30%	over 30%
71-80	Below 13%	13 - 25%	25 - 30%	over 30%

Females Age Range (years)	Too Little	Healthy Range	Overweight	Obese
20-30	Below 21%	21 - 33%	33 - 39%	over 25%
31-40	Below 21%	21 - 33%	33 - 39%	over 25%
41-50	Below 23%	23 - 35%	35 - 40%	over 27%
51-60	Below 23%	23 - 35%	35 - 40%	over 27%
61-70	Below 24%	24 - 36%	36 - 42%	over 30%
71-80	Below 24%	24 - 36%	36 - 42%	over 30%

From:
http://www.weightlossforall.com/fat-percentage-ideal.htm